MeasureThat.net

Run results for: Caching with loop conditions

Comparing performance of with and without caching array length.

Go to the benchmark
Run details:
Mozilla/5.0 (Linux; Android 12; M2102J20SG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.5481.192 Mobile Safari/537.36 OPR/74.1.3922.71199
Opera Mobile 74
Android
Mobile
2 years ago
Test name Executions per second
With cache 10589.2 Ops/sec
Without cache 5421.3 Ops/sec
While loop (as performance reference) 10713.4 Ops/sec
Script Preparation code:
AخA
 
var arr = [...Array(1000).keys()];
Tests:

  • With cache

     
    let sum = 0;
    for (let i = 0, arrLen=arr.length; i < arrLen; i++){
      sum += arr[i];
    }

  • Without cache

     
    let sum = 0;
    for (let i = 0; i < arr.length; i++){
      sum += arr[i];
    }

  • While loop (as performance reference)

     
    let sum = 0;
    let i = arr.length;
    while(i--){
      sum += arr[i]
    }